Machine for grinding pulleys



(No Model.) 4 Sheets-Sheet 1.

I 1". MISIMMONS. MACHINE E011 GRINDING PULLBYS.

110. 251,141. Patented 11612111881.

WITNEssEs` m INVENTOR *MMW /'Wffcza /zmw m l ATToRNEY N. PETERS. PhawALimugnpnr. wmhingwn. D. C.

(No Model.) 4 Sheets-Sheet 2.

P. M. SIMMONS.

MACHINE FOR GRINDING PULLBYS. No. 251,141. Patented Dee. 20,1881.

WITNEssEs %/,M// W INVENTOP.

/z-uM/@W ATTORNEY N. PETERS. Phawumagmphur. wmhi nnnnnnnn C.

(No Model.) 4 Sheets-Sheet 3.

P. 1v1. SIMMONS MACHINE FOR GRINDING PULLBYIS.

No. 251,141. l Patented Dec. 20,1881.

/ Mlm WITNEssEs P .v INVENTOR f M2M :5M www ATTORNEY (No Model.)

F. M. SIMMONS.

MAGHINBPOR GRINDING PULLBYS.

Patented Deo. 20,1881.

ATTORNEY N. PETERS. Pnuluxhagnphu. wamingtw. u. C.

UNITED STATES PATENT p OEEICE.

FRANK M. SIMMONS, OF DETROIT, I\IIOHIGAN.

MACHINE FOR GRINDING PULLEYS.

SPECIFICATION forming part of Letters Patent No. 251,141, dated December 20, 1881. Application iiled August 23, 1881. (No model.)

To all whom 'it may concern Be it known that I, FRANK MORELL SIM- MONS, of Detroit,county of Wayne, State of Michigan, have invented a new and useful Improvement in Machines for Grinding` Pulleys; and I declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accom panying drawings, which form a part of this specification.

My invention consists in apparatus her` inafter described for presenting the face of the pulley properly to the emery-wheel, for causing the einerylwheel to traverse across the face of the pulley, for presenting the pulley so as to dress its face with the usual central ridge, and in other features of construction.

In the drawings, Figure l represents a front elevation of an apparatus embodying my invention. Fig. 2 is a side elevation adjacentto the drive-pulley, Fig. 3, a side elevation adjacent to the pulley which revolves the pulley,

wheel that-is being dressed. Fig. 4 is a plan view,illustrating also the operating mecha-nism for causing the emery-wheel to traverseacross the vface of the pulley, but with pulley and emery-Wheel removed. Fig. 5 is a detail view, illustrating a portion of the reversing-gear.

A is a frame. B is a screw-shaft designed to support the pulley to bc dressed. Itis housed at its end in journals B', which are pivoted to sliding head-blocks B2, which latter are adjusted to slide upon ways B3 as they are actuated by the adjusting-screws B4. Set-screws b, set into recesses bin the journals B, prevent any longitudinal thrust of the shaft.

C is a pulley that is in position to be ground. A belt wheel or pulley, Z, on shaft B affords means for giving rapid rotation to thesaid pulley O. It is held in position and centered by the slidingconicalheads O', which are thrust into the pulley-eye, and forced firmly into place by thejam-nuts O2. By loosening the screws bthe shaft B may be slid to the right, orin the direction` of the pulley Z, sufficiently to remove it from its bearing at the left-hand end, and then the nut and conical head next that end may be removed in order to permit the placing of the pulley on the shaft, after which the parts may all be replaced in position, as shown.

D is a sliding shaft, which bears the emerywheel or other grinder, d. Itis rotated by any suitable means--as for instance, by a belt leading to the pulley d. D is an arm connecting one end of this shaft with a sliding bar, D2. An arm, D3, bearing a stationary nut, d3, atits free end, is firmly collared or otherwise rigidly secured to the bar D2.

A screw-shaft, E, engages the threads ofthe nut d3. This shaft E can rotate freely, but has no longitudinal movement. Upon it there are two cog-wheels, E E2. The wheel E meshes directly with a loose pinion, F', on the powershaft F, while the other provides for areve'rse motion by first meshing-with an intermediate pinion, F3, which in turn engages the loose pinion F2 on the power-shaft. A clntch,Gr, is located between the loose pinions F/ F2, and is permitted to slide freely toward either pillion; but a feather-and-groove connection with the power-shaft F causes the clutch to rotate with the shaft. The clutch G is caused to e11- gage either pinion F F2 by projecting pins entering corresponding oritices or engaging corresponding lugs on the pinion.

The operation ofthis portion ofthe device will now be understood. We will presume a rapid rotation to have been imparted to the pulley O that is to be dressed, and to the emery-grinder d. The belt is thrown upon the power-pulley F4, which imparts rotation to the shaft F. The clutch is now, by thelever G', thrown into gear with the pinion F. Thiscauses the screw-shaft E to turn, and in working through the nut d3 the latter is forced, say, to the right, carrying with it the bar D2, and the emery-Wheel shaft D, causing it to travel across the face of the pulley. Vhen ithas gone farenough the clutch Gr is disengaged and slid over and engaged with the pinion F2. This, through the in termediate pinion, F3, imparts a reverse motion to the screw-shaft E, and consequently causes the emery-wheel shaft and wheel to traverse in the opposite direction.

I will now describe how this reversing operation is rendered automatic.

I is a sliding bar. At one end it is provided with two adjustable blocks, l I2, which are so located that the heel Pof thearm D will travel between them. At theother end of this bar is a rack, I3, meshing with a pinion, I4, on the ICO shaft of/a toppling weight, J. An arm, G',

loosely engagesthe clutch G, and, leading back, is rst pivoted to the bar I at @and then pivoted to a stationary plate at i', which point becomes the fulcrum of the lever-arm G. Now, the emery-Wheel having been adjusted at one edge of the pulley C at its starting-point, the blocks I l2 are correspondingly adjusted, so that When the emery-Wheelhas nearly completed its travel the heel d2 will engage one of the blocks I', and as it proceeds farther the barvI is slid lengthwise, and gradually disengages the clutch G from the pinion F. lAt the same time the rack and pinion l3 I4 havelifted the weight J so that its center of gravity is nearly over its shaft. Now, as the bar I is moved-a little farther and the clutch G has nearly disengaged, the weight J topples over, and forcing the lever G With it, the clutch is suddenly thrown across, engages with the pinion F2, and the emery-Wheel starts on its back travel. When it is near the end of its return travel a similar operation takes place, which reverses it, and so on.

In order to present the pulley C so that it shall be dressed to leave a central ridge, it is only necessary to adj ust one of the head-blocks B2 nearer to the emery-Wheel than the other. A suction from K may draw in and force away the dust from the machine u hen in operation. l/Vith suitable cone-pulleys or other speedinggear the Wheel G maybe given any desired speed.

By an apparatus of this character I am enabled to dress the faces of pulley-wheels with great accuiacy and with wonderful celerity, taking only a l'ew minutes to do what required hours of labor to do inelectually by the old method.

What I claim isl. In a pulley-grinding machine, the combinatioinwith an endwise-movable shaft carrying agrinding-WheeLand ashaftarranged to carry and provided with means for holding a pulley to be ground, ofmeansfor traversingthe grinding-Wheel back and forth automatically across the face of the pulley While grinding the same, and mechanism for adj usting the opposite edges of the face of the pulley alternately toward the grinding-wheel, substantially as described.

2. In combination with an endwise-movable sha-ft carrying an emery-Wheel and a shaft carrying the pulley to be ground, a. pair ofheadblocks carrying the bearings for the latter shaft, these head-blocks being independently adjustable toward or from said emery-wheel shaft, substantially as set forth.

3. In combination with the grinding-Wheel and its endWise-movable rotary shaft and the pulley-carrying shaft, the shifting and reversing mechanism, substantially as described, for changing the endwise motion of said grinding- Wheel shaft, a shipping-lever for such mechanism, and devices for automatically shifting said shipping-lever, substantially as described.

4. In combination with a shaft arranged to carry and provided with means for holding a pulley to be ground,an endwise-movable shaft carrying a grin(ling\vl1ee1, a sliding bar provided With means for engaging and moving said grinding-wheel shaft, a nut and screwshaft which moves said sliding bar, a pair of cog-Wheels on said screw-shaft, an additional shaft having two loose pinions, one of which engages directly with one of said cog-Wheels and the other of which connects With the other cog-wheel through an intermediate pinion, a clutch arranged to lock either of said loose pinions toits shaft, alever which moves said clutch, a sliding bar pivotally connected with said lever and arranged to shift the same, and a rack, pinion, and toppling Weight arranged to reverse the motion ofthe latter bar, all arranged to operate substantially as set forth.

In testimony whereof I sign this specification in the presence of two witnesses.

FRANK MORELL SIMMONS.

Witnesses:

J. EDWARD WARREN, SAMUEL E. THOMAS. 

